from django.conf import settings
from django.core.mail import send_mail
from django_redis import get_redis_connection
from rest_framework import mixins
from rest_framework import serializers
from celery_tasks.email.tasks import send_verify_url
from goods.models import SKU
from .models import User, Address


class RegisterUerSerializer(serializers.ModelSerializer):
    # write_only: 只写、只校验、不入库、也不需要返回到前端浏览
    password2 = serializers.CharField(min_length=8, max_length=20, label="确认密码", write_only=True)
    sms_code = serializers.CharField(min_length=6, max_length=6, label="短信验证码", write_only=True)
    allow = serializers.CharField(label="协议", write_only=True)
    token = serializers.CharField(label="jwt口令", read_only=True)
    class Meta:
        # 参考User模型类
        model = User
        # 生成哪些字段
        fields = ("id","username","password","password2","mobile","sms_code","allow","token")

        read_only_fields = ["id"]

        extra_kwargs = {
            "password":{
                "min_length": 8,
                "max_length": 20,
                "write_only": True,
            }
        }

    # 1.单字段校验， allow协议
    def validate_allow(self, value):

        if value != "true":
            raise serializers.ValidationError("必须同意协议")

        return value

    # 2.校验多字段，密码，短信
    def validate(self, attrs):
        # 0.取出手机号和短信验证码
        sms_code = attrs["sms_code"]    # 验证码
        mobile = attrs["mobile"]    # 手机号

        # 1.校验密码
        if attrs["password"] != attrs["password2"]:
            raise serializers.ValidationError("两次密码不相等")

        # 2.校验短信
        redis_conn = get_redis_connection("code")
        redis_sms_code = redis_conn.get("sms_code_%s" % mobile)

        # 3.判断是否过期
        if not redis_sms_code:
            raise serializers.ValidationError("短信验证码已过期")

        # 4.校验正确性
        if sms_code != redis_sms_code.decode():
            raise serializers.ValidationError("短信验证码填写错误")

        # 5.返回
        return attrs

    # 3.由于User中没有password2, sms_code,allow,所以需要去除
    def create(self, validated_data):
        # 1.去除不需要的数据
        del validated_data["password2"]
        del validated_data["sms_code"]
        del validated_data["allow"]

        # 2.创建对象
        user = super(RegisterUerSerializer, self).create(validated_data)

        # 2.1密码加密
        user.set_password(validated_data["password"])
        user.save()

        # 设置JWT
        from rest_framework_jwt.settings import api_settings
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        # 3.返回
        return user


class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ("id", "username", "mobile", "email", "email_active")


class EmailSendSerializer(serializers.Serializer):
    email = serializers.EmailField(label="邮箱")

    def update(self, instance, validated_data):
        # 1.将邮箱设置到用户对象
        email = validated_data["email"]
        instance.email = email
        instance.save()

        # 2.发送邮件
        verify_url =instance.generate_verify_url()
        # send_mail(subject = "来自美多商城, 请点击验证",
        #           message = verify_url,
        #           from_email = settings.EMAIL_FROM,
        #           recipient_list = [email])
        send_verify_url.delay(verify_url, email)    # 使用celery发送

        # 3.返回
        return validated_data


class AddressSerializer(serializers.ModelSerializer):
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label="省id")
    city_id = serializers.IntegerField(label="市id")
    district_id = serializers.IntegerField(label="区id")

    class Meta:
        model = Address
        exclude = ("user","is_deleted","create_time","update_time")


    # 重写序列化器的create方法， 目的是为了补充user
    def create(self, validated_data):
        validated_data["user"] = self.context["request"].user
        return super(AddressSerializer, self).create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Address
        fields = ("title",)


class UserBrowerHistorySerializer(serializers.Serializer):
    sku_id = serializers.IntegerField(min_value=1, label="商品编号")

    # 1.单子段校验
    def validate_sku_id(self, value):
        # 1.通过sku_id获取sku对象
        try:
            sku = SKU.objects.get(id=value)
        except Exception as e:
            raise serializers.ValidationError("商品不存在")

        # 2.返回
        return value
    # 2.重写create方法，需要保存记录redis中
    def create(self, validated_data):
        # 1.获取sku_id
        sku_id = validated_data.get("sku_id")
        user = self.context["request"].user

        # 2.获取redis对象
        redis_conn = get_redis_connection("history")

        # 3.去重
        redis_conn.lrem("history_%s" % user.id, 0, sku_id)

        # 4.存储
        redis_conn.lpush("history_%s" % user.id, sku_id)

        # 5.截取5条
        redis_conn.ltrim("history_%s" % user.id, 0, 4)

        # 6.返回
        return validated_data








